package com.TheEndWork.tenDay;

/**
 * @authoer zsj
 * @date 2022/6/1 9:19
 */
public class alg {

    public class ListNode {
        int val;
        ListNode next;

        ListNode() {
        }

        ListNode(int val) {
            this.val = val;
        }

        ListNode(int val, ListNode next) {
            this.val = val;
            this.next = next;
        }
    }

    /**
     * 给你单链表的头节点 head ，请你反转链表，并返回反转后的链表。
     */
    public ListNode reverseList(ListNode head) {
        ListNode prev = null;
        ListNode curr = head;
        while (curr != null) {
            ListNode next = curr.next;
            curr.next = prev;
            prev = curr;
            curr = next;
        }
        return prev;
    }


}
